* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
a {
  // 继承父集颜色
  color: inherit;
  text-decoration: none;
  -webkit-tap-highlight-color: transparent;
}
img {
  vertical-align: middle;
}
h1,
h2,
h3,
h4,
h5,
h6 {
  // 继承父集字号
  font-size: inherit;
}
